Blender

Blender is the free open source 3D content creation suite, available for all major operating systems under the GNU General Public License. Blender was developed as an in-house application by the Dutch animation studio NeoGeo and Not a Number Technologies (NaN). It is a powerful program contains features that are characteristic of high-end 3D software. Highly recomended.

Supported Platforms

    Windows XP, Vista, 7
    Mac OS X (PPC and Intel)
    Linux
    FreeBSD

Blender works on 32 and 64 bit systems